Unpatched browser weaknesses can be exploited to track millions of Web users | Ars Technica Over the weekend, a researcher demonstrated two unpatched weaknesses that Web masters can exploit to track millions of people who visit their sites. Taken together, the attacks allow websites to compile a list of previously visited domains, even when users have flushed their browsing history, and to tag visitors with a tracking cookie that will persist even after users have deleted all normal cookies.

Meanwhile back in reality, what even normal techies can do, forget about what the capabilities of the NSA might be...